Which mode should be used to command the EVAP system running tests?

The choice of Mode 8 for commanding the EVAP (Evaporative Emission Control) system running tests is appropriate because this mode is specifically designed for system diagnostics and tests related to the EVAP system. In Mode 8, technicians can initiate commands that allow for the monitoring and testing of various components within the EVAP system, such as leak detection, fuel level sensors, and purge valve operation.

This mode enables the technician to command the vehicle's onboard diagnostic system to perform specific tests that can determine if the EVAP system is functioning correctly. By running these tests, technicians can quickly identify potential issues that may cause evaporative emissions failures or fuel vapors to escape, ultimately contributing to a vehicle's compliance with emissions regulations.

Using the correct mode for diagnostics is vital for effective troubleshooting—Mode 8 provides the necessary commands and feedback that support the successful repair or verification of the EVAP system’s performance.